NFPA 921 Exam Questions and Answers Fully Solved Latest Version 2025-2026
3.2.1* Approved. - Answers Acceptable to the authority having jurisdiction.
3.2.2* Code. - Answers A standard that is an extensive compilation of
provisions covering broad subject matter or that is suitable for adoption into law independently of other
codes and standards.
3.2.3* Guide. - Answers A document that is advisory or informative in
nature and that contains only non-mandatory provisions. A guide may contain mandatory statements
such as when a guide can be used, but the document as a whole is not suitable for adoption into law.
3.2.4* Recommended Practice. - Answers A document that is similar in
content and structure to a code or standard but that contains only non-mandatory provisions using the
word "should" to indicate recommendations in the body of the text.
3.2.5* Standard. - Answers An NFPA Standard, the main text of which
contains only mandatory provisions using the word "shall" to indicate requirements and that is in a form
generally suitable for mandatory reference by another standard or code or for adoption into law. Non-
mandatory provisions are not to be
considered a part of the requirements of a standard and shall be located in an appendix, annex,
footnote, informational note, or other means as permitted in the NFPA Manual of Style.
When used in a generic sense, such as in the phrase "standards development process" or "standards
development activities," the term "standards" includes all NFPA Standards, including
Codes, Standards, Recommended Practices, and Guides.
3.3.1* Absolute Temperature. - Answers A temperature measured in Kelvins (K) or Rankines (R).
3.3.2 Accelerant. - Answers A fuel or oxidizer, often an ignitible liquid,
intentionally used to initiate a fire or increase the rate of growth or spread of fire.
3.3.3 Accident - Answers An unplanned event that interrupts an activity and sometimes causes injury or
damage or a chance occurrence arising from unknown causes; an unexpected happening due to
carelessness, ignorance, and the like.
3.3.4 Active Fire Protection System. - Answers A system that uses moving mechanical or electrical parts
to achieve a fire protection goal.
3.3.5 Ambient. - Answers Someone's or something's surroundings, especially
, as they pertain to the local environment; for example, ambient air and ambient temperature.
3.3.6 Ampacity. - Answers The maximum current, in amperes, that a
conductor can carry continuously under the conditions of use without exceeding its temperature rating.
[70, Article 100]
3.3.7 Ampere. - Answers The unit of electric current that is equivalent
to a flow of one coulomb per second; one coulomb is defined as 6.24 × 1018 electrons.
3.3.8 Arc. - Answers A high-temperature luminous electric discharge
across a gap or through a medium such as charred insulation.
3.3.9 Arc Mapping. - Answers The systematic evaluation of the electrical
circuit configuration, spatial relationship of the circuit components, and identification of electrical arc
sites to assist in the identification of the area of origin and analysis of the fire's spread.
3.3.10 Arc Site. - Answers The location on a conductor with localized
damage that resulted from an electrical arc.
3.3.11 Arcing Through Char. - Answers Arcing associated with a matrix
of charred material (e.g., charred conductor insulation) that acts as a semi-conductive medium.
3.3.12 Area of Origin. - Answers A structure, part of a structure, or
general geographic location within a fire scene, in which the "point of origin" of a fire or explosion is
reasonably believed to be located. (See also 3.3.142, Point of Origin.)
3.3.13 Arrow Pattern. - Answers A fire pattern displayed on the cross section
of a burned wooden structural member.
3.3.14 Arson. - Answers The crime of maliciously and intentionally, or
recklessly, starting a fire or causing an explosion.
3.3.15 Auto ignition. - Answers Initiation of combustion by heat but
without a spark or flame.
3.3.16 Autoignition Temperature. - Answers The lowest temperature at which a combustible material
ignites in air without a spark orflame.
3.3.17 Backdraft. - Answers A deflagration resulting from the sudden
3.2.1* Approved. - Answers Acceptable to the authority having jurisdiction.
3.2.2* Code. - Answers A standard that is an extensive compilation of
provisions covering broad subject matter or that is suitable for adoption into law independently of other
codes and standards.
3.2.3* Guide. - Answers A document that is advisory or informative in
nature and that contains only non-mandatory provisions. A guide may contain mandatory statements
such as when a guide can be used, but the document as a whole is not suitable for adoption into law.
3.2.4* Recommended Practice. - Answers A document that is similar in
content and structure to a code or standard but that contains only non-mandatory provisions using the
word "should" to indicate recommendations in the body of the text.
3.2.5* Standard. - Answers An NFPA Standard, the main text of which
contains only mandatory provisions using the word "shall" to indicate requirements and that is in a form
generally suitable for mandatory reference by another standard or code or for adoption into law. Non-
mandatory provisions are not to be
considered a part of the requirements of a standard and shall be located in an appendix, annex,
footnote, informational note, or other means as permitted in the NFPA Manual of Style.
When used in a generic sense, such as in the phrase "standards development process" or "standards
development activities," the term "standards" includes all NFPA Standards, including
Codes, Standards, Recommended Practices, and Guides.
3.3.1* Absolute Temperature. - Answers A temperature measured in Kelvins (K) or Rankines (R).
3.3.2 Accelerant. - Answers A fuel or oxidizer, often an ignitible liquid,
intentionally used to initiate a fire or increase the rate of growth or spread of fire.
3.3.3 Accident - Answers An unplanned event that interrupts an activity and sometimes causes injury or
damage or a chance occurrence arising from unknown causes; an unexpected happening due to
carelessness, ignorance, and the like.
3.3.4 Active Fire Protection System. - Answers A system that uses moving mechanical or electrical parts
to achieve a fire protection goal.
3.3.5 Ambient. - Answers Someone's or something's surroundings, especially
, as they pertain to the local environment; for example, ambient air and ambient temperature.
3.3.6 Ampacity. - Answers The maximum current, in amperes, that a
conductor can carry continuously under the conditions of use without exceeding its temperature rating.
[70, Article 100]
3.3.7 Ampere. - Answers The unit of electric current that is equivalent
to a flow of one coulomb per second; one coulomb is defined as 6.24 × 1018 electrons.
3.3.8 Arc. - Answers A high-temperature luminous electric discharge
across a gap or through a medium such as charred insulation.
3.3.9 Arc Mapping. - Answers The systematic evaluation of the electrical
circuit configuration, spatial relationship of the circuit components, and identification of electrical arc
sites to assist in the identification of the area of origin and analysis of the fire's spread.
3.3.10 Arc Site. - Answers The location on a conductor with localized
damage that resulted from an electrical arc.
3.3.11 Arcing Through Char. - Answers Arcing associated with a matrix
of charred material (e.g., charred conductor insulation) that acts as a semi-conductive medium.
3.3.12 Area of Origin. - Answers A structure, part of a structure, or
general geographic location within a fire scene, in which the "point of origin" of a fire or explosion is
reasonably believed to be located. (See also 3.3.142, Point of Origin.)
3.3.13 Arrow Pattern. - Answers A fire pattern displayed on the cross section
of a burned wooden structural member.
3.3.14 Arson. - Answers The crime of maliciously and intentionally, or
recklessly, starting a fire or causing an explosion.
3.3.15 Auto ignition. - Answers Initiation of combustion by heat but
without a spark or flame.
3.3.16 Autoignition Temperature. - Answers The lowest temperature at which a combustible material
ignites in air without a spark orflame.
3.3.17 Backdraft. - Answers A deflagration resulting from the sudden
